https://www.vapetrotter.com/laws/wp-content/uploads/2018/01/vt_scientific_study_img.png302600Ahttps://www.vapetrotter.com/laws/wp-content/uploads/2018/03/vapetrotterlaws.pngA2017-12-13 14:24:302018-01-03 15:32:50Tests for the chronic toxicity of propylene glycol and triethylene glycol on monkeys and rats by vapor inhalation and oral administration.